diff options
Diffstat (limited to 'drivers/staging/xillybus/xillybus_of.c')
| -rw-r--r-- | drivers/staging/xillybus/xillybus_of.c | 212 |
1 files changed, 212 insertions, 0 deletions
diff --git a/drivers/staging/xillybus/xillybus_of.c b/drivers/staging/xillybus/xillybus_of.c new file mode 100644 index 000000000000..92c2931f4348 --- /dev/null +++ b/drivers/staging/xillybus/xillybus_of.c @@ -0,0 +1,212 @@ +/* + * linux/drivers/misc/xillybus_of.c + * + * Copyright 2011 Xillybus Ltd, http://xillybus.com + * + * Driver for the Xillybus FPGA/host framework using Open Firmware. + * + * This program is free software; you can redistribute it and/or modify + * it under the smems of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + */ + +#include <linux/module.h> +#include <linux/device.h> +#include <linux/slab.h> +#include <linux/platform_device.h> +#include <linux/of.h> +#include <linux/of_irq.h> +#include <linux/of_address.h> +#include <linux/of_device.h> +#include <linux/of_platform.h> +#include "xillybus.h" + +MODULE_DESCRIPTION("Xillybus driver for Open Firmware"); +MODULE_AUTHOR("Eli Billauer, Xillybus Ltd."); +MODULE_VERSION("1.06"); +MODULE_ALIAS("xillybus_of"); +MODULE_LICENSE("GPL v2"); + +static const char xillyname[] = "xillybus_of"; + +/* Match table for of_platform binding */ +static struct of_device_id xillybus_of_match[] = { + { .compatible = "xlnx,xillybus-1.00.a", }, + {} +}; + +MODULE_DEVICE_TABLE(of, xillybus_of_match); + +static void xilly_dma_sync_single_for_cpu_of(struct xilly_endpoint *ep, + dma_addr_t dma_handle, + size_t size, + int direction) +{ + dma_sync_single_for_cpu(ep->dev, dma_handle, size, direction); +} + +static void xilly_dma_sync_single_for_device_of(struct xilly_endpoint *ep, + dma_addr_t dma_handle, + size_t size, + int direction) +{ + dma_sync_single_for_device(ep->dev, dma_handle, size, direction); +} + +static dma_addr_t xilly_map_single_of(struct xilly_cleanup *mem, + struct xilly_endpoint *ep, + void *ptr, + size_t size, + int direction + ) +{ + + dma_addr_t addr = 0; + struct xilly_dma *this; + + this = kmalloc(sizeof(struct xilly_dma), GFP_KERNEL); + if (!this) + return 0; + + addr = dma_map_single(ep->dev, ptr, size, direction); + this->direction = direction; + + if (dma_mapping_error(ep->dev, addr)) { + kfree(this); + return 0; + } + + this->dma_addr = addr; + this->dev = ep->dev; + this->size = size; + + list_add_tail(&this->node, &mem->to_unmap); + + return addr; +} + +static void xilly_unmap_single_of(struct xilly_dma *entry) +{ + dma_unmap_single(entry->dev, + entry->dma_addr, + entry->size, + entry->direction); +} + +static struct xilly_endpoint_hardware of_hw = { + .owner = THIS_MODULE, + .hw_sync_sgl_for_cpu = xilly_dma_sync_single_for_cpu_of, + .hw_sync_sgl_for_device = xilly_dma_sync_single_for_device_of, + .map_single = xilly_map_single_of, + .unmap_single = xilly_unmap_single_of +}; + +static int xilly_drv_probe(struct platform_device *op) +{ + struct device *dev = &op->dev; + struct xilly_endpoint *endpoint; + int rc = 0; + int irq; + + endpoint = xillybus_init_endpoint(NULL, dev, &of_hw); + + if (!endpoint) + return -ENOMEM; + + dev_set_drvdata(dev, endpoint); + + rc = of_address_to_resource(dev->of_node, 0, &endpoint->res); + if (rc) { + pr_warn("xillybus: Failed to obtain device tree " + "resource\n"); + goto failed_request_regions; + } + + if (!request_mem_region(endpoint->res.start, + resource_size(&endpoint->res), xillyname)) { + pr_err("xillybus: request_mem_region failed. Aborting.\n"); + rc = -EBUSY; + goto failed_request_regions; + } + + endpoint->registers = of_iomap(dev->of_node, 0); + + if (!endpoint->registers) { + pr_err("xillybus: Failed to map I/O memory. Aborting.\n"); + goto failed_iomap0; + } + + irq = irq_of_parse_and_map(dev->of_node, 0); + + rc = request_irq(irq, xillybus_isr, 0, xillyname, endpoint); + + if (rc) { + pr_err("xillybus: Failed to register IRQ handler. " + "Aborting.\n"); + rc = -ENODEV; + goto failed_register_irq; + } + + rc = xillybus_endpoint_discovery(endpoint); + + if (!rc) + return 0; + + free_irq(irq, endpoint); + +failed_register_irq: + iounmap(endpoint->registers); +failed_iomap0: + release_mem_region(endpoint->res.start, + resource_size(&endpoint->res)); + +failed_request_regions: + xillybus_do_cleanup(&endpoint->cleanup, endpoint); + + kfree(endpoint); + return rc; +} + +static int xilly_drv_remove(struct platform_device *op) +{ + struct device *dev = &op->dev; + struct xilly_endpoint *endpoint = dev_get_drvdata(dev); + int irq = irq_of_parse_and_map(dev->of_node, 0); + + xillybus_endpoint_remove(endpoint); + + free_irq(irq, endpoint); + + iounmap(endpoint->registers); + release_mem_region(endpoint->res.start, + resource_size(&endpoint->res)); + + xillybus_do_cleanup(&endpoint->cleanup, endpoint); + + kfree(endpoint); + + return 0; +} + +static struct platform_driver xillybus_platform_driver = { + .probe = xilly_drv_probe, + .remove = xilly_drv_remove, + .driver = { + .name = xillyname, + .owner = THIS_MODULE, + .of_match_table = xillybus_of_match, + }, +}; + +static int __init xillybus_of_init(void) +{ + return platform_driver_register(&xillybus_platform_driver); +} + +static void __exit xillybus_of_exit(void) +{ + platform_driver_unregister(&xillybus_platform_driver); +} + +module_init(xillybus_of_init); +module_exit(xillybus_of_exit); |